U.S.C.G. Merchant Marine Exam Assistant Engineer – UFIV ... · Which term represents the ability of a speed control governor to maintain prime mover speed without hunting? o (A)

National Maritime Center Serving Our Nation’s Mariners

U.S.C.G. Merchant Marine Exam

Assistant Engineer – UFIV

Q693 General Subjects

(Sample Examination)

Page 1 of 27 Q693 General Subjects

8/28/2019

Q693 General Subjects U.S.C.G. Merchant Marine Exam UFIV-Assistant Engineer Illustrations: 14

Choose the best answer to the following Multiple Choice Questions

1. Which of the following bilge pumping applications would most likely use a non-automated centrifugal pump under manual supervision?

o (A) Machinery space bilges o (B) Engine room bilges • (C) Dry cargo-hold bilges o (D) Shaft alley bilges

If choice C is selected set score to 1.

2. Which of the following compressors would be used for a dead ship start-up of a ship's service diesel-generator on a motor ship?

• (A) Emergency air compressor o (B) Topping air compressor o (C) Ship's service air compressor o (D) Starting air compressor

If choice A is selected set score to 1.

3. In a closed-loop process control system, what statement concerning feedback is true as it relates to stability and the direction of error displacement?

o (A) Positive feedback is used to minimize instability by pushing the system in the opposite direction as the error displacement.

• (B) Negative feedback is used to minimize instability by pushing the system in the opposite direction as the error displacement.

o (C) Negative feedback is used to minimize instability by pushing the system in the same direction as the error displacement.

o (D) Positive feedback is used to minimize instability by pushing the system in the same direction as the error displacement.

If choice B is selected set score to 1.

4. Which of the following liquid level sensors would be most suitable for measuring the liquid level in a pressure vessel, such as a water-tube boiler steam drum?

• (A) Differential pressure sensor o (B) Static pressure sensor o (C) Capacitance probe o (D) Displacement float level sensor



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Q693 General Subjects U.S.C.G. Merchant Marine Exam UFIV-Assistant Engineer Illustrations: 14 5. With respect to shaft bearing load absorption capability in terms of direction, what is meant by an

axial load?

o (A) An axial load is a load applied tangent to the circumference of the shaft. • (B) An axial load is a load applied parallel to the axis of the shaft. o (C) An axial load is a load applied perpendicular to the axis of the shaft. o (D) An axial load is a load applied perpendicular and parallel to the axis of the shaft.


6. According to the illustration, which of the following conditions would most likely cause pump "A" to short cycle? Illustration GS-0173

• (A) The hydro-pneumatic expansion tank is operating with an insufficient air charge. o (B) The hydro-pneumatic tank is operating with a low water level. o (C) A low water level exists in the potable water storage tank. o (D) Pump "A" wearing rings have excessive clearance.


7. Which term represents the ability of a speed control governor to maintain prime mover speed without hunting?

o (A) Promptness • (B) Stability o (C) Deadband o (D) Sensitivity


8. If both the shell-and-tube lube oil cooler and shell-and-tube jacket water cooler of a diesel engine are sea water-cooled, what statement is true?

o (A) Sea water flows through the shells of both the lube oil and jacket water coolers. o (B) Sea water flows through the tubes of the lube oil cooler and through the shell of the jacket

water cooler. o (C) Sea water flows through the tubes of the jacket water cooler and through the shell of the lube

oil cooler. • (D) Sea water flows through the tubes of both the lube oil and jacket water coolers.

If choice D is selected set score to 1.

9. Energy losses occurring in a hydraulic system are ultimately absorbed by the __________.

o (A) reservoir expansion chamber o (B) hydraulic piping flexibility o (C) fluid as friction • (D) atmosphere as heat



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Q693 General Subjects U.S.C.G. Merchant Marine Exam UFIV-Assistant Engineer Illustrations: 14 10. Which characteristic or condition will have the greatest effect on increasing a hydraulic oil's

viscosity?

o (A) Cloud point • (B) Pressure o (C) Vacuum o (D) Pour point


11. A precharged bladder-type accumulator used in a hydraulic system, can be potentially dangerous if __________.

• (A) compressed air is used rather than an inert gas o (B) the bladder contacts the top of the poppet o (C) the inert gas is exposed to hydraulic oil o (D) it is precharged with dry nitrogen


12. In which lubrication application is a detergent type oil most likely to be used?

o (A) Air compressor lubricating oil. o (B) Steam turbine lubricating oil. o (C) Crosshead diesel engine bearing lubricating oil. • (D) Trunk type diesel engine lubricating oil.


13. What type of oil as part of an oily-water mixture is most likely to require heating to facilitate separation in an oily-water separator?

o (A) Steam turbine lubricating oil. o (B) Diesel engine lubricating oil. o (C) Marine diesel oil. • (D) Heavy residual fuel oil.


14. Permanent centrifugal pump shaft damage due to erosion, corrosion, and wear at the stuffing box is usually prevented by __________.

o (A) internally flooded lantern rings o (B) wearing rings • (C) renewable sleeves o (D) a hardened sprayed metal coating



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Q693 General Subjects U.S.C.G. Merchant Marine Exam UFIV-Assistant Engineer Illustrations: 14 15. Which of the following propulsor types would be used with unidirectional propulsion shafting

rotation?

o (A) Fixed-pitch propellers • (B) Controllable-pitch propellers o (C) Tandem propellers o (D) Detachable-blade (built-up) propellers


16. What provision is made for sea chests for removal of solid debris restricting the entry grating into the sea chest of a machinery space sea water cooling system?

o (A) The debris is continuously removed by blowing the sea chest clear with either compressed air or steam by cracking open the blow valve, as appropriate.

o (B) The debris is continuously removed by draining the sea chest clear by cracking open a drain valve located at the bottom of the sea chest.

• (C) The debris may be removed by blowing the sea chest clear with either compressed air or steam, as appropriate.

o (D) The debris may be removed by draining the sea chest clear by opening a drain valve located at the bottom of the sea chest.


17. The "tare weight" of a refrigerant storage cylinder refers to what weight?

o (A) the maximum weight of the refrigerant allowed o (B) the total weight of a fully charged cylinder • (C) the weight of an empty cylinder o (D) the weight of a cylinder AND its current contents


18. What is the pressure and condition of the refrigerant entering the receiver of a refrigeration system?

o (A) superheated high-pressure vapor o (B) subcooled low-pressure liquid • (C) subcooled high-pressure liquid o (D) superheated low-pressure vapor



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19. The safety heads of most large reciprocating compressors used in refrigeration systems are held in place by what means?

o (A) discharge pressure in the relief valve return line o (B) tack welding on the sides o (C) large Teflon gaskets • (D) heavy coil springs


20. Capacity control of a centrifugal refrigeration compressor can be accomplished by what means?

o (A) varying the position discharge bypass valve o (B) varying the speed of the compressor o (C) varying the position of the prerotation inlet vanes • (D) all of the above


21. Which of the following illustrated thermal expansion valves would be appropriate to use on an evaporator coil with a 2 psi pressure drop, where externally adjustable superheat and a replaceable power element are both desired? Illustration RA-0006

o (A) A • (B) B o (C) C o (D) D


22. As shown in figure "B" of the illustrated self-contained recovery unit connection diagrams, what is the recovery method supported by the connection scheme? Illustration RA-0033

• (A) direct vapor recovery o (B) direct liquid recovery o (C) liquid recovery/push-pull o (D) vapor recovery/push-pull


23. Which of the illustrated devices would be the LEAST accurate for the purposes of weighing-in a refrigerant charge? Illustration RA-0045

o (A) A o (B) B • (C) C o (D) D



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Q693 General Subjects U.S.C.G. Merchant Marine Exam UFIV-Assistant Engineer Illustrations: 14 24. In a two-stage centrifugal air conditioning system such as the one illustrated, the liquid refrigerant

passes from the condenser directly to what component? Illustration RA-0064

• (A) economizer o (B) expansion valve o (C) chiller o (D) evaporator


25. The output volume of a positive fixed displacement pump can be changed only by __________.

o (A) moving the shaft trunnion block o (B) moving the slide block and rotor • (C) changing the speed of the pump o (D) changing the angle of the tilting plate


26. Which of the listed temperature measuring devices installed on a large turbo-electric alternating current propulsion generator would be the most reliable for monitoring generator temperatures to avoid premature winding insulation failure?

• (A) Temperature sensors inserted in the stator slots for measuring stator winding temperature. o (B) Temperature sensors measuring the temperature of the cooling water associated with the

generator air cooler. o (C) Temperature sensors measuring the temperature of the cooling air associated with the

generator air cooler. o (D) Current transformers are the most reliable means of monitoring generator temperatures.


27. Ships requiring extremely rapid maneuvering response using propeller shaft speed and direction as the sole means of controlling propeller thrust are most likely to use what type of drive system?

o (A) Steam turbine geared drive • (B) Diesel-electric drive o (C) Direct or geared diesel drive o (D) Gas turbine geared drive



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28. In accordance with 33 CFR Subchapter O (Pollution), which type of Marine Sanitation Device (MSD) is used solely for the storage of sewage and flush water at ambient air pressure and temperature?

o (A) Type I o (B) Type II • (C) Type III o (D) Type IV


29. In an electro-hydraulic steering system, damage due to rudder shock is prevented by __________.

o (A) buffer springs • (B) relief valves o (C) oil flowing through the pumps o (D) dashpots


30. Which of the following statements is true concerning the operation of the device shown in the illustration? Illustration GS-0116

o (A) Item "I" moves as the rudder stock rotates. • (B) Item "N" moves as the rudder stock rotates. o (C) Both item "I" and item "N" move as the rudder stock rotates. o (D) Neither item "I" nor item "N" move as the rudder stock rotates.


31. Four incandescent lamps are connected in series in a single circuit. If one of the lamp filaments burns out, what will happen to the other lamps?

• (A) all go out o (B) become dimmer o (C) no change in brightness o (D) become brighter


32. Which of the drill sets listed would commonly be referred to as a 'Jobbers Set'?

o (A) A set of fractional size drills from 1/2'' to 2''. • (B) A set of fractional size drills from 1/16'' to 1/2''. o (C) A set of lettered size drills from A to Z. o (D) A set of numbered size drills from 1 to 60.



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Q693 General Subjects U.S.C.G. Merchant Marine Exam UFIV-Assistant Engineer Illustrations: 14 33. The locking plates shown in the illustration are used in many marine applications. Which figure

indicates the improper method for using these devices? Illustration GS-0156

o (A) "A" o (B) "B" • (C) "C" o (D) "D"


34. Suppose the pilot pressure range is from 3 to 15 psig for the illustrated pneumatically operated diaphragm actuated control valve. Assuming the control valve is trimmed for a linear response and the travel position indicator is calibrated in percentage, what would be the approximate valve position with a 9 psig pilot pressure? Illustration GS-0051

o (A) 25% open o (B) 33% open • (C) 50% open o (D) 75% open


35. As shown in the illustration, if figure "21" indicates the "TOP VIEW" of an orthographic projection, and figure "11" indicates the "FRONT VIEW", which figure would best represent the correct "RIGHT SIDE VIEW"? Illustration GS-0165

o (A) Figure "2" o (B) Figure "8" • (C) Figure "10" o (D) Figure "15"


36. The working depth of the gear illustrated is represented by __________. Illustration GS-0111

• (A) A o (B) B o (C) C o (D) I



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37. Suppose the illustrated self-contained, internal-pilot, piston-operated temperature control valve is part of the temperature control system for a steam-heated heavy fuel oil service heater for a steam boiler. If there was an increase in demand for fuel by the boiler, what statement correctly represents how the valve would initially respond? Illustration GS-0045

o (A) The fuel oil heater fuel outlet temperature would increase, causing the remote bulb pressure to increase and the thermostatic diaphragm to flex upward and through lever action, further open the pilot valve.

• (B) The fuel oil heater fuel outlet temperature would decrease, causing the remote bulb pressure to decrease and the thermostatic diaphragm to flex upward and through lever action, further open the pilot valve.

o (C) The fuel oil heater fuel outlet temperature would increase, causing the remote bulb pressure to increase and the thermostatic diaphragm to flex downward and through lever action, further close the pilot valve.

o (D) The fuel oil heater fuel outlet temperature would decrease, causing the remote bulb pressure to decrease and the thermostatic diaphragm to flex downward and through lever action, further close the pilot valve.


38. To measure the circumference of a piece of pipe, you should use a __________.

o (A) machinist's steel rule • (B) flexible steel rule o (C) hook rule o (D) folding rule


39. The best tool to use to measure the number of threads per inch on a bolt is a __________.

• (A) screw pitch gauge o (B) tap o (C) micrometer o (D) pair of outside calipers


40. Which statement is true concerning the total power consumed in a parallel circuit?

o (A) The total power is the sum of the powers consumed by each load (resistor) divided by the number of loads.

o (B) The total power is always less than the power consumed by the smallest load. o (C) The total power is never more than the power consumed by the largest load. • (D) The total power is equal to the sum of the powers consumed by each individual load.



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Q693 General Subjects U.S.C.G. Merchant Marine Exam UFIV-Assistant Engineer Illustrations: 14 41. Periodic testing using a special sensing device may be performed to detect potentially dangerous

loose or corroded bus bar and controller connections. What is the name of this testing technology?

o (A) electric vibro-analysis o (B) visual pyrotronics • (C) infra-red thermography o (D) corrosion electrolysis


42. Which of the substances listed can be used to shield sensitive equipment from static magnetic fields?

• (A) Iron o (B) Mica o (C) Bakelite o (D) Glass


43. What does the symbol in figure "1" shown in the illustration represent? Illustration EL-0065

• (A) PNP bipolar junction transistor o (B) silicon controller rectifier o (C) junction field effect transistor o (D) NPN bipolar junction transistor


44. To keep emergency lead-acid batteries in a full state of charge for emergency use, what is normally done?

o (A) Batteries are kept charged by performing an equalizing charge daily. • (B) Batteries are kept charged by maintaining a continuous trickle charge. o (C) Batteries are kept charged by maintaining the maximum charging rate. o (D) Batteries are kept charged by cycling through discharge and charge cycles daily.


45. What is the most reliable and preferred method for determining the state of charge of a wet cell NiCad battery while it is being charged?

o (A) Measuring the specific gravity of each cell with a hydrometer. o (B) Measuring the battery voltage with a solenoid type voltage tester. • (C) Measuring the battery voltage with a digital voltmeter. o (D) Measuring the temperature corrected specific gravity of each cell with a hydrometer and

thermometer.



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Q693 General Subjects U.S.C.G. Merchant Marine Exam UFIV-Assistant Engineer Illustrations: 14 46. Which of the following motors has a frame configuration for solid base mounting only? Illustration

EL-0184

• (A) A o (B) B o (C) C o (D) D


47. What is the name of the type of motor control circuit that will not permit automatic restarting after power is restored, following a power failure?

• (A) low voltage protection o (B) reduced voltage restart o (C) overload lockout o (D) low voltage release


48. What is the basic similarity between a circuit breaker and a fuse?

o (A) after a short or overload condition, both must be reset to re-energize the circuit o (B) after a short or overload condition, both have to be replaced before the circuit can be re-

energized • (C) after a short or overload condition, both should open to de-energize the circuit o (D) a circuit breaker and a fuse have no similarities


49. For the power hacksaw shown in the illustration, how should the teeth point for the blade being installed? Illustration GS-0187

o (A) pointing away from the motor end of the machine • (B) pointing toward the motor end of the machine o (C) pointing either toward or away from the motor end of the machine o (D) pointing toward the motor if using a 4 or 6 tooth blade and away from the motor if using a 10

or 14 tooth blade



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50. Which of the listed temperature sensors is made of heat-treated metallic oxides and generally has anegative coefficient of resistance?

o (A) Resistance temperature detector• (B) Thermistoro (C) Bimetallic deviceo (D) Thermocouple



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National Maritime Center

Serving Our Nation’s Mariners

10/5/2018

EL-0065

Adapted for testing purposes only from GROB, Basic Electronics, 4th Edition

Copyright © 1977 by The McGraw-Hill Companies, Inc.

Further reproduction prohibited without permission



Serving Our Nation’s Mariners

10/10/2018

EL-0184

Adapted for testing purposes only Further reproduction prohibited without permission Page 15 of 27


National Maritime Center Serving Our Nation's Mariners

9/24/2018

GS-0045

Adapted for testing purposes only from Les-Sonic Self Contained

Pressure/Temperature Regulators

Copyright © by Leslie Co.

Further reproduction prohibited without permission Page 16 of 27 Q693 General Subjects


9/24/2018

GS-0051

Adapted for testing purposes only from MOLLAND

The Maritime Engineering Reference Book

Copyright © 2008 by Elsevier Ltd.



9/26/2018

GS-0111

Adapted for testing purposes only from DUDLEY, Gear Handbook

Copyright © 1962 by McGraw-Hill, Inc.



9/26/2018

GS-0116

Adapted for testing purposes only from HUNT, Modern Marine Engineer’s Manual, Volume II

Copyright © 2002 by Cornell Maritime Press, Inc.



9/27/2018

GS-0156

Adapted for testing purposes only from D379, D398, D399 Service Manual

Copyright © Caterpillar Tractor Co.



9/27/2018

GS-0165

Adapted for testing purposes only



9/27/2018

GS-0173

Adapted for testing purposes only from ROWEN, Introduction to Practical Engineering, Volume 2

Copyright © 2005 by the Society of Naval Architects and Marine Engineers



4/16/2019

GS-0187

Adapted for testing purposes only from FEIRER, Machine Tool Metalworking, Principles and Practices

Copyright © 1961 by the McGraw-Hill Book Company



Serving Our Nation's Mariners

9/17/2018

RA-0006





9/18/2018

RA-0033

Adapted for testing purposes only from CARR, Refrigerants and the Environment

Copyright © 1993 by John Carr




9/18/2018

RA-0045


Further reproduction prohibited without permission Page 26 of 27




9/18/2018

RA-0064

Adapted for testing purposes only from HARBACH, Marine Refrigeration and Air-Conditioning

Copyright © 2005 by Cornell Maritime Press


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U.S.C.G. Merchant Marine Exam Assistant Engineer – UFIV ... · Which term represents the ability of a speed control governor to maintain prime mover speed without hunting? o (A)